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[DllImport("user32.dll", EntryPoint = "SendMessageA")]
static extern int SendMessage(IntPtr hwnd, int wMsg, int wParam, StringBuilder lParam);
const int WM_GETTEXT = 0xd;
private void button1_Click(object sender, EventArgs e)
{
const int buffer_size = 1024;
StringBuilder buffer = new StringBuilder(buffer_size);
SendMessage(this.textBox1.Handle, WM_GETTEXT, buffer_size, buffer);
MessageBox.Show(buffer.ToString());
}